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M68ICS08GR Datasheet(PDF) 331 Page - Freescale Semiconductor, Inc

Part # M68ICS08GR
Description  M68HC08 Microcontrollers
PDF  408 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68ICS08GR Datasheet(HTML) 331 Page - Freescale Semiconductor, Inc

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Timebase Module (TBM)
Timebase Register Description
MC68HC908GR8 — Rev 4.0
Technical Data
MOTOROLA
Timebase Module (TBM)
331
21.5 Timebase Register Description
The timebase has one register, the TBCR, which is used to enable the
timebase interrupts and set the rate.
TBIF — Timebase Interrupt Flag
This read-only flag bit is set when the timebase counter has rolled
over.
1 = Timebase interrupt pending
0 = Timebase interrupt not pending
TBR2:TBR0 — Timebase Rate Selection
These read/write bits are used to select the rate of timebase interrupts
as shown in Table 21-1.
Address:
$001C
Bit 7
654321
Bit 0
Read:
TBIF
TBR2
TBR1
TBR0
0
TBIE
TBON
Reserved
Write:
TACK
Reset:
00000000
= Unimplemented
Figure 21-2. Timebase Control Register (TBCR)
Table 21-1. Timebase Rate Selection for OSC1 = 32.768 kHz
TBR2
TBR1
TBR0
Divider
Timebase Interrupt Rate
Hz
ms
0
0
0
32,768
1
1000
0
0
1
8192
4
250
0
1
0
2048
16
62.5
0
1
1
128
256
~ 3.9
1
0
0
64
512
~2
1
0
1
32
1024
~1
1
1
0
16
2048
~0.5
1
1
1
8
4096
~0.24
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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